(1) If both Assertion (A) and Reason (R) are True and the Reason (R) is a correct explanation of...

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(1) If both Assertion (A) and Reason (R) are True and the Reason (R) is a correct explanation of the Assertion (A).
(2) If both Assertion (A) and Reason (R) are True but Reason (R) is not a correct explanation of the Assertion \( (A) \).
(3) If Assertion (A) is True but the Reason (R) is False.
(4) If Assertion (A) is False but Reason (R) is True.
Assertion (A): Entropy change in reversible adiabatic expansion of an ideal gas is zero.
Reason (R): The increase in entropy due to volume increase just compensates for the decrease in entropy due to a fall in temperature.
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